Combi boiler and cutting off water supply

mnjfranks

Hi

I want to install new bath taps, but have no issolation valve that I can see on the pipes meaning I have to turn off the supply from the mains.

Normally I would be happy to do this, but I have just had a new combi boiler fitted and am worried if I cut off the supply that it may run dry, cut off or do something I cant fix myself.

Any advice on what is the best way to go ahead?

Many thanks guys and gals

Jase

ChrisR · Posted: Sun Dec 31, 2006 12:01 pm Post Subject:

It's safe, just turn off the mains! Heating can/will still work ok.

mnjfranks · Posted: Sun Dec 31, 2006 12:05 pm Post Subject:

What a fast response!

How about the pressure in the boiler? Would I need to increase the pressure after?

My thinking is that when I stop the infeed, and drain the taps then the water in the boiler will also be removed.

ChrisR · Posted: Sun Dec 31, 2006 12:09 pm Post Subject:

No it's a separate sealed system.The filling loop is supposed to be left removed, though few are, but it will have two taps and there's a non-return valve anyway.

mnjfranks · Posted: Sun Dec 31, 2006 12:13 pm Post Subject:

Well I am confident now then that I can crack on with the work, I thank you Chris for your time and speed.

I was going to ask about the 2 valves on the boiler pipes (I have 6 pipes but 2 have a cut off valves similar to a washing machine pipe 1 red and 1 blue) and wether I have to close them, but will see how I get on!

mnjfranks · Posted: Sun Dec 31, 2006 12:20 pm Post Subject:

Just thinking

When I run off the hot water tap, the water will come from the boiler and will enpty that.

Still safe to do that? Surely with the infeed closed, and hot water being drained it will run dry....

kevplumb · Posted: Sun Dec 31, 2006 12:25 pm Post Subject:

no

would be a good idea to switch it off first tho

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mnjfranks · Posted: Sun Dec 31, 2006 12:27 pm Post Subject:

So this would lead to empty hot water in the boiler then which I am worried about I think

kevplumb · Posted: Sun Dec 31, 2006 12:35 pm Post Subject:

mnjfranks wrote:

So this would lead to empty hot water in the boiler then which I am worried about I think

in which case you are in a minority of 1 it's not a problem

__________________
a little thanks

goes a long way

mnjfranks · Posted: Sun Dec 31, 2006 12:39 pm Post Subject:

So this is a safe way then.

Will go ahead with that, and refill the system after. I can get the pressure up to 1.2 or so (amateurs!) so guess this is all I need to do.

Ta

kevplumb · Posted: Sun Dec 31, 2006 12:41 pm Post Subject:

mnjfranks wrote:

So this is a safe way then.

Will go ahead with that, and refill the system after. I can get the pressure up to 1.2 or so (amateurs!) so guess this is all I need to do.

Ta

all you need to do is turn off the stoptap you won't drain the boiler it's 2 seperate parts heating/water

__________________
a little thanks

goes a long way

mnjfranks · Posted: Sun Dec 31, 2006 12:44 pm Post Subject:

But I will need to drain the bath and sink taps which will come from the boiler

Sorry if I seem very amateurish, but I am

kevplumb · Posted: Sun Dec 31, 2006 12:48 pm Post Subject:

it's got nothing to do with the heating side of the boiler

turn the stoptap off drain your taps and plough on changing them

__________________
a little thanks

goes a long way

mnjfranks · Posted: Sun Dec 31, 2006 12:49 pm Post Subject:

My thanks to you both